Siemens 3VA4145-4ED24-0AA0 molded case circuit breaker is rated 45A with 2 poles, 1 phase and rated voltages of 240VAC, 480VAC and 600Y/347VAC. It provides interrupting ratings of 14kAIC at 600Y/347VAC and 25kAIC at 480V, standard protection, and a thermal magnetic trip with fixed thermal and fixed magnetic settings and long-time and instantaneous functions. The 3VA41 frame has panelboard and switchboard mounting and a load side lug connection. Dimensions are 5.09 in high, 2 in wide and 2.96 in deep. It has UL approval and WEEE, RoHS and REACh standards.
How should I use the 45A rating when selecting the Siemens 3VA4145-4ED24-0AA0?
The breaker has a rated current of 45A. Select it by checking the calculated circuit load and conductor ampacity against the applicable installation requirements, rather than choosing by load current alone.
How do I choose among its voltage ratings?
Match the circuit voltage and system configuration to the 240VAC, 480VAC or 600Y/347VAC rating. The 600Y/347VAC rating applies to a grounded-wye system, so system configuration matters as well as voltage.
How do I check whether its interrupting rating is adequate?
Compare the available fault current at the installation point with the interrupting rating at the applicable voltage: 25kAIC at 480V or 14kAIC at 600Y/347VAC. The available fault current must not exceed the applicable interrupting rating.
How does the thermal-magnetic trip protect the circuit?
The thermal element provides long-time overload protection, while the magnetic element provides instantaneous response to high fault current. This combines delayed response to overloads with rapid response to short circuits.
Can I adjust the overload or instantaneous trip settings?
Both the thermal and magnetic trip settings are fixed. Select this breaker when the circuit protection design calls for fixed settings rather than field-adjustable overload or instantaneous settings.
What dimensions should I allow for when planning the installation?
The breaker measures 5.09 in high, 2 in wide and 2.96 in deep. Use these dimensions for physical layout planning, while allowing the wiring space and working clearances required for the installation.
What does the 2-pole rating mean for circuit planning?
This breaker has 2 poles for overcurrent protection. Use the pole count when planning the circuit's protected current paths; it describes the number of poles, not the amperage rating.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 5 reviews.
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I recommend this product
Rated 5 out of 5 stars
7/27/26
SuperBreakers has you covered
SuperBreakers has you covered when you’re in a pinch and need breakers at the last minute. Their customer service is excellent, and the team consistently goes above and beyond to help. I highly recommend them!
RS
Rob S.
Verified Buyer
Reviewing
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I recommend this product
Rated 5 out of 5 stars
4/8/26
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Very helpful and arrived quickly.
JB
Josh B.
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Reviewing
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I recommend this product
Rated 5 out of 5 stars
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Jeff L.
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I recommend this product
Rated 5 out of 5 stars
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Better than new
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Ken C.
Verified Buyer
Reviewing
Siemens 3VA4150-4ED34-0AA0 - 50A 3 Pole Molded Case Circuit Breaker